Table 2.

Quality appraisal quantitative studies .

Author	Power calculation reported	Response rate (%)	Reliability and validity of study instrument established	Method of data analysis
Groat et al [29]	No	Not reported	No	Correlation analysis
Gonder-Frederick et al [30]	No	Not reported	Yc	Analysis of covariance
Skrosveth et al [31]	No	Not reported	No	Regression analysis
Tansey et al [27]	No	Not reported	Yes	Correlation analysis
Kamble et al [32]	No	Not reported	Yes	Correlation analysis
Martinez-Sarrigui et al [33]	No	Not reported	No	Regression analysis
Gonzalez-Molero et al [34]	No	Not reported	Yes	Correlation analysis
Kirwan et al [35]	Yes	Not reported	Yes	Regression analysis
Polonsky et al [36]	No	48.6	No	Regression analysis
Barnard et al [37]	No	96.7	No	Correlation analysis
Naranjo et al [38]	No	Not reported	Yes	Correlation analysis
Borges and Kubiak [39]	No	Not reported	Yes	Factor analysis